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fix(kiss_modem): improve RX delivery and noise floor sampling

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agessaman 2026-02-06 16:31:20 -08:00 • committed by ViezeVingertjes
parent 1af013c741
commit f445b5acdc
3 changed files with 29 additions and 10 deletions
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5
examples/kiss_modem/KissModem.cpp
View file

@ -99,6 +99,11 @@ void KissModem::loop() {
if (_rx_len < KISS_MAX_FRAME_SIZE) {
_rx_buf[_rx_len++] = b;
} else {
/* Buffer full with no FEND; reset so we don't stay stuck ignoring input. */
_rx_len = 0;
_rx_escaped = false;
_rx_active = false;
}
}

2
examples/kiss_modem/KissModem.h
View file

@ -197,4 +197,6 @@ public:
void onPacketReceived(int8_t snr, int8_t rssi, const uint8_t* packet, uint16_t len);
bool isTxBusy() const { return _tx_state != TX_IDLE; }
/** True only when radio is actually transmitting; use to skip recvRaw in main loop. */
bool isActuallyTransmitting() const { return _tx_state == TX_SENDING; }
};

32
examples/kiss_modem/main.cpp
View file

@ -112,16 +112,12 @@ void setup() {
void loop() {
modem->loop();
if ((uint32_t)(millis() - next_noise_floor_calib_ms) >= NOISE_FLOOR_CALIB_INTERVAL_MS) {
radio_driver.triggerNoiseFloorCalibrate(0);
next_noise_floor_calib_ms = millis();
}
radio_driver.loop();
if (!modem->isTxBusy()) {
if ((uint32_t)(millis() - next_agc_reset_ms) >= AGC_RESET_INTERVAL_MS) {
radio_driver.resetAGC();
next_agc_reset_ms = millis();
if (!modem->isActuallyTransmitting()) {
if (!modem->isTxBusy()) {
if ((uint32_t)(millis() - next_agc_reset_ms) >= AGC_RESET_INTERVAL_MS) {
radio_driver.resetAGC();
next_agc_reset_ms = millis();
}
}
uint8_t rx_buf[256];
@ -131,5 +127,21 @@ void loop() {
int8_t rssi = (int8_t)radio_driver.getLastRSSI();
modem->onPacketReceived(snr, rssi, rx_buf, rx_len);
}
/* Sample noise floor right after drain: we're in STATE_RX so wrapper can collect. */
for (int i = 0; i < 16; i++) {
radio_driver.loop();
}
}
/* Trigger starts a new 64-sample calibration window every 2s. */
if ((uint32_t)(millis() - next_noise_floor_calib_ms) >= NOISE_FLOOR_CALIB_INTERVAL_MS) {
radio_driver.triggerNoiseFloorCalibrate(0);
next_noise_floor_calib_ms = millis();
}
radio_driver.loop();
if (!modem->isActuallyTransmitting()) {
for (int i = 0; i < 15; i++) {
radio_driver.loop();
}
}
}